Remove unused usings

Author: ErikSchierboom

exercises/concept/annalyns-infiltration/AnnalynsInfiltration.cs

@@ -1,5 +1,3 @@
-using System;
-
 static class QuestLogic
 {
     public static bool CanFastAttack(bool knightIsAwake)

exercises/concept/annalyns-infiltration/AnnalynsInfiltrationTests.cs

@@ -1,4 +1,3 @@
-using Xunit;
 using Exercism.Tests;
 
 public class AnnalynsInfiltrationTests

exercises/concept/attack-of-the-trolls/AttackOfTheTrolls.cs

@@ -1,4 +1,4 @@
-using System;
+
 
 // TODO: define the 'AccountType' enum
 

exercises/concept/attack-of-the-trolls/AttackOfTheTrollsTests.cs

@@ -1,4 +1,3 @@
-using Xunit;
 using Exercism.Tests;
 
 public class AttackOfTheTrollsTests

exercises/concept/authentication-system/AuthenticationSystem.cs

@@ -1,5 +1,3 @@
-using System.Collections.Generic;
-
 public class Authenticator
 {
     private class EyeColor

exercises/concept/authentication-system/AuthenticationSystemTests.cs

@@ -1,6 +1,3 @@
-using System;
-using System.Collections.Generic;
-using Xunit;
 using Exercism.Tests;
 
 public class AuthenticationSystemTests

exercises/concept/beauty-salon-goes-global/BeautySalonGoesGlobal.cs

@@ -1,6 +1,3 @@
-using System;
-
-
 public enum Location
 {
     NewYork,

exercises/concept/beauty-salon-goes-global/BeautySalonGoesGlobalTests.cs

@@ -1,9 +1,5 @@
-using System;
-using System.Collections.Generic;
 using System.Globalization;
-using System.Linq;
-using System.Threading;
-using Xunit;
+
 using Exercism.Tests;
 
 public class BeautySalonGoesGlobalTests

exercises/concept/bird-watcher/BirdWatcher.cs

@@ -1,5 +1,3 @@
-using System;
-
 class BirdCount
 {
     private int[] birdsPerDay;

exercises/concept/bird-watcher/BirdWatcherTests.cs

@@ -1,4 +1,3 @@
-using Xunit;
 using Exercism.Tests;
 
 public class BirdWatcherTests